Detect the beaglebone black platform running Arch Linux

Author: iorbitearth

Adafruit_DHT/platform_detect.py

@@ -51,7 +51,9 @@ def platform_detect():
         return BEAGLEBONE_BLACK
     elif plat.lower().find('armv7l-with-glibc2.4') > -1:
         return BEAGLEBONE_BLACK
-    
+    elif plat.lower().find('armv7l-with-arch') > -1:
+        return BEAGLEBONE_BLACK
+
     # Couldn't figure out the platform, just return unknown.
     return UNKNOWN